How does an intercalating agent such as ethidium bromide cause mutations?
What will be an ideal response?
The substance fits between adjacent bases on one strand of a DNA sequence, causing the complementary strand to be miscopied during replication. This usually results in a frameshift mutation.
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Vertebrates with external fertilization produce eggs that (select all correct choices):
A. have a yolk to provide nutrients to the developing embryo. B. obtain oxygen via diffusion from the environment. C. eliminate wastes via diffusion into the environment. D. obtain water via diffusion from the environment. E. are laid on or near substrates like rocks to
A group of interbreeding individuals occupying the same habitat at the same time is a(n)
A. species. B. guild. C. population. D. equilibrium. E. quadrat.
Experimentation
A. provides a means to gather objective data. B. is designed to support an hypothesis. C. provides a means to gather subjective data. D. is designed to refute an hypothesis. E. is the first step in the scientific method.
Clonal deletion of developing T lymphocytes takes place in which location(s) in the body?
A. the bone marrow B. the spleen C. the liver D. both the bone marrow and the spleen E. the thymus